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Finding the Fourth Proportional to 1,439.62, 1,986.86 and 942.68

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Solution

The fourth proportional to 1,439.62, 1,986.86 and 942.68 is: 1,301.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.62 : 1,986.86 = 942.68 : x
  2. Step 2: Convert to fraction form
    1,439.62/1,986.86 = 942.68/x
  3. Step 3: Cross multiply
    1,439.62x = 1,986.86 × 942.68
  4. Step 4: Simplify right side
    1,439.62x = 1,872,973.18
  5. Step 5: Solve for x
    x = 1,872,973.18/1,439.62
  6. Step 6: Final answer
    x = 1,301.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.